Adverbs: forms [ from

Adverbs ending in -ward(s) or -wise
There is a small group of adverbs which end in -ward(s) or -wise. The -ward(s) words can end in either -ward or -wards (inward, inwards).

1. 
   -wards: inwards, eastwards, upwards, downwards
   
2. 
   -wise: clockwise, lengthwise, likewise
   

The doctor asked her to move her head upwards but she couldn’t.
Turn the handle clockwise to start it.
He’s the one that they all love. Whatever he does, they do likewise. (They do the same thing.)
Adverbs with the same form as adjectives
Some adverbs have the same form as adjectives. The most common are: fast (not fastly), left, hard, outside, right, straight, late, well, and time words such as daily, weekly, monthly, yearly.
Compare

adjective	adverb
This coconut is really hard. You’ll need a hammer to break it up.	You have to bang the door hard to shut it.
She drives a fast car.	They can swim quite fast now actually.
An outside light would be a really good idea for our house.	When I went outside, the light came on automatically.
I get a monthly pay cheque.	My company pays me monthly.

Warning:
Don’t confuse adjectives and adverbs. Adjectives modify nouns or are used after verbs such as be, become, seem, look, smell, taste.
She walks very elegantly. (adverb of manner, describing how she walks)
He wore an elegant suit and a silk tie. (adjective describing the suit)
She looks very elegant in that long skirt. (adjective after look)